Color coding of digital subtraction angiography in assessment of hemodynamic changes before and after carotid stent implantation / 中国介入影像与治疗学

ABSTRACT

Objective: To evaluate the feasibility of color coding of DSA (CC-DSA) in assessment of hemodynamic changes before and after carotid artery stenting (CAS). Methods: Data of 16 patients with severe stenosis at the beginning of internal carotid artery who underwent CAS were analyzed retrospectively. DSA images before and after CAS were processed with CC-DSA software to get the corresponding color coded images. The points of interest (POI) were set up in common carotid artery, C1 segment of internal carotid artery, M1 segment of middle cerebral artery and transverse sinus, respectively, and the time to peak (TTP) as well as the relative time to peak (rTTP) of each POI were collected. Meanwhile, the peak systolic velocity (PSV) and end-diastolic velocity (EDV) of the anterior and posterior carotid artery stenosis segments and the distal end of the internal carotid artery C1 segment (normal lumen) were collected. Results: TTP and rTTP of C1 segment of internal carotid artery and M1 segment of middle cerebral artery after CAS were lower than those before CAS (all P0.05). Compared with those before CAS, PSV and EDV in carotid artery stenosis segment decreased, and PSV in the distal segment C1 of internal carotid artery increased after CAS (all P<0.05). The change value of TTP in C1 segment of internal carotid artery before and after CAS was positively correlated with the change values of PSV (rs=0.500, P=0.049) and EDV (rs=0.522, P=0.038) at the distal end. Conclusion: CC-DSA can quantitatively evaluate the hemodynamic changes before and after CAS in patients with internal carotid artery stenosis.